'The Amazing Spider-Man' easily won the weekend box office (it helps to open Monday at midnight and have a 6-day opening "weekend") earning $75 million in it's first 3 days ($140M total), making it a huge success by any standard.
Unless your standard is the other Spider-Man movies, from the trilogy that ended just 5 years ago, because 'Spider-Man' earned $115 million in it's first 3 days. 'Spider-Man 2' made $130 million, and 'Spider-Man 3' topped them both with $151 million. The re-boot made $40M less than the lowest one, despite the advantage of higher ticket prices on 3D (which accounted for 44 percent of sales) and IMAX (which accounted for 10 percent).
But it still made tons of money so Sony doesn't really give a shit if you saw it because you somehow don't know the most famous origin story in all fiction or saw it because you're just kind of obligated to see movies like this in the summer. I didn't do either. You can't just film the same fucking action with new people and expect me to watch it. Unless we're talking about porn, in which case I totally will.